Bioflavonoidsare naturals substances often found in supplements. Bioflavonoidsincrease the effects of vitamin C and are often combined in the better supplements. Bioflavonoids are often combined in sources with vitamin C like citrus fruits and cranberry. Using this product greatly increase the absorbtion of many vitamins and in particular vitamin C. We sell only natural flavonoids in potent formulation and from well known brands. Flavonoids are pigments of fruit, flowers and berries to give them their colors and especially in medicinal herbs, fruit, vegetables, nuts and seeds, plant-based beverages such as tea and wine. Bioflavonoids have a synergistic effect with antioxidants as vitamin C and promote their performance.